ARM: samsung: fix kerneldoc of s3c_pm_do_restore_core()

Fix W=1 compile warnings (invalid kerneldoc):

    arch/arm/plat-samsung/pm-common.c:68: warning: Function parameter or member 'ptr' not described in 's3c_pm_do_restore_core'
    arch/arm/plat-samsung/pm-common.c:68: warning: Function parameter or member 'count' not described in 's3c_pm_do_restore_core'

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>