ARM: entry: data abort: use r2 as base of pt_regs rather than stack

Now that we pass r2 into these helper functions as the pointer to
pt_regs, use r2 as the base of the registers on the stack rather
than using the stack pointer directly.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --cc arch/arm/mm/abort-lv4t.S
Simple merge

diff --cc arch/arm/mm/proc-arm6_7.S
Simple merge