[ARM] Move processor_modes[] to .../process.c

bad_mode() currently prints the mode which caused the exception, and
then causes an oops dump to be printed which again displays this
information (since the CPSR in the struct pt_regs is correct.)  This
leads to processor_modes[] being shared between traps.c and process.c
with a local declaration of it.

We can clean this up by moving processor_modes[] to process.c and
removing the duplication, resulting in processor_modes[] becoming
static.

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

arch/arm/kernel/entry-armv.S

@@ -99,7 +99,6 @@ common_invalid:
 					@ cpsr_<exception>, "old_r0"
 
 	mov	r0, sp
-	and	r2, r6, #0x1f
 	b	bad_mode
 
 /*