ARM: bcm: Select ARM_TIMER_SP804 for ARCH_BCM_NSP

The NSP SoC includes an SP804 timer so should be enabled here.

Fixes: a0efb0d2

 ("ARM: dts: NSP: Add SP804 Support to DT")
Signed-off-by: Matthew Hagan <mnhagan88@gmail.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>