[POWERPC] bootwrapper: fix build error on virtex405-head.S
[POWERPC] bootwrapper: fix build error on virtex405-head.S

virtex405-head.S is an assembler file, not a C file; therefore BOOTAFLAGS
is the correct place to set the needed -mcpu=405 flag.

Signed-off-by: Grant Likely <9069e6f5a2b566e2674a0ba1e2bf39c12c195fad@secretlab.ca>
Signed-off-by: Josh Boyer <94755a79aca753e683bb6d0e796d473b797056eb@linux.vnet.ibm.com>

KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas