[media] DM04/QQBOX memcpy to const char fix

Driver Version v1.75 Kernel oops appears in 2.6.37-rc8 in
lme_firmware_switch because of a memcpy to a const char.

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>