android: amd/common/gfx10: add register JSON

android: amd/common/gfx10: add register JSON

The necessary Android makefile building rules are added
and the generation rules are simplified for readability

Fixes the following building errors:

external/mesa/src/amd/common/ac_llvm_build.c:1496:45:
error: use of undeclared identifier 'V_008F0C_IMG_FORMAT_8_UINT'
   case V_008F0C_BUF_DATA_FORMAT_8: format = V_008F0C_IMG_FORMAT_8_UINT; break;
                                             ^
Fixes: 74a26af ("amd/common/gfx10: add register JSON")
Signed-off-by: Mauro Rossi <issor.oruam@gmail.com>
Acked-by: Marek Olšák <marek.olsak@amd.com>