android: util: Add a mapping from VkFormat to PIPE_FORMAT.

android: util: Add a mapping from VkFormat to PIPE_FORMAT.

Updates Makefile.sources and fixes the following building error:

In file included from external/mesa/src/vulkan/util/vk_format.c:24:
In file included from external/mesa/src/vulkan/util/vk_format.h:28:
external/mesa/src/util/format/u_format.h:33:10: fatal error: 'pipe/p_format.h' file not found
#include "pipe/p_format.h"
         ^~~~~~~~~~~~~~~~~
1 error generated.

Fixes: 3a28281 ("util: Add a mapping from VkFormat to PIPE_FORMAT.")
Signed-off-by: Mauro Rossi <issor.oruam@gmail.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>