Build error: versatile express

arch/arm/mach-vexpress/tc2_pm.c: In function 'tc2_pm_down.clone.0':
arch/arm/mach-vexpress/tc2_pm.c:200:1: error: fp cannot be used in asm here

This is caused by the assembly code in this file clobbering R11, which
is incompatible with having CONFIG_FRAME_POINTER=y.