android: avoid compile warnnings

android: avoid compile warnnings

To avoid the warnings(errors):

hardware/intel/common/vaapi/src/gen75_vme.c:1070:5: error: variable 'i965_kernel_num' is used uninitialized whenever switch default is taken [-Werror,-Wsometimes-uninitialized]
    default:
    ^~~~~~~
hardware/intel/common/vaapi/src/gen75_vme.c:1078:35: note: uninitialized use occurs here
    vme_context->vme_kernel_sum = i965_kernel_num;
                                  ^~~~~~~~~~~~~~~

hardware/intel/common/vaapi/src/gen9_vme.c:2036:5: error: variable 'i965_kernel_num' is used uninitialized whenever switch default is taken [-Werror,-Wsometimes-uninitialized]
    default:
    ^~~~~~~
hardware/intel/common/vaapi/src/gen9_vme.c:2044:35: note: uninitialized use occurs here
    vme_context->vme_kernel_sum = i965_kernel_num;
                                  ^~~~~~~~~~~~~~~

I am not going to disable the warning (by -Wno-sometimes-uninitialized)
since it's still a useful checking from the compiler.

Signed-off-by: Chih-Wei Huang <cwhuang@linux.org.tw>