OMAP2: fixup doc comments in omap_device

The documentation comments in this file are out of
date with the code, so fix this to avoid the
following warnings:

arch/arm/mach-omap2/omap_device.c:133: warning: Function parameter or member 'pdev' not described in 'omap_device_build_from_dt'
arch/arm/mach-omap2/omap_device.c:133: warning: Excess function parameter 'pdev_name' description in 'omap_device_build_from_dt'
arch/arm/mach-omap2/omap_device.c:133: warning: Excess function parameter 'pdev_id' description in 'omap_device_build_from_dt'
arch/arm/mach-omap2/omap_device.c:133: warning: Excess function parameter 'oh' description in 'omap_device_build_from_dt'
arch/arm/mach-omap2/omap_device.c:133: warning: Excess function parameter 'pdata' description in 'omap_device_build_from_dt'
arch/arm/mach-omap2/omap_device.c:133: warning: Excess function parameter 'pdata_len' description in 'omap_device_build_from_dt'
arch/arm/mach-omap2/omap_device.c:309: warning: Function parameter or member 'pdev' not described in 'omap_device_get_context_loss_count'
arch/arm/mach-omap2/omap_device.c:309: warning: Excess function parameter 'od' description in 'omap_device_get_context_loss_count'
arch/arm/mach-omap2/omap_device.c:335: warning: Function parameter or member 'ohs' not described in 'omap_device_alloc'
arch/arm/mach-omap2/omap_device.c:335: warning: Function parameter or member 'oh_cnt' not described in 'omap_device_alloc'
arch/arm/mach-omap2/omap_device.c:335: warning: Excess function parameter 'oh' description in 'omap_device_alloc'
arch/arm/mach-omap2/omap_device.c:335: warning: Excess function parameter 'pdata' description in 'omap_device_alloc'
arch/arm/mach-omap2/omap_device.c:335: warning: Excess function parameter 'pdata_len' description in 'omap_device_alloc'
arch/arm/mach-omap2/omap_device.c:659: warning: Function parameter or member 'pdev' not described in 'omap_device_register'
arch/arm/mach-omap2/omap_device.c:659: warning: Excess function parameter 'od' description in 'omap_device_register'
arch/arm/mach-omap2/omap_device.c:682: warning: Function parameter or member 'pdev' not described in 'omap_device_enable'
arch/arm/mach-omap2/omap_device.c:682: warning: Excess function parameter 'od' description in 'omap_device_enable'
arch/arm/mach-omap2/omap_device.c:713: warning: Function parameter or member 'pdev' not described in 'omap_device_idle'
arch/arm/mach-omap2/omap_device.c:713: warning: Excess function parameter 'od' description in 'omap_device_idle'

Signed-off-by: Ben Dooks (Codethink) <ben.dooks@codethink.co.uk>
Signed-off-by: Tony Lindgren <tony@atomide.com>