Support "gbm_device_is_format_supported()" on msm backend

[jeonghee27]

Hello.

I'm porting Chromium to the QCS6490 board, and I have a question about a crash that occurs when I turn on GBM.

//gbm.c
gbm_device_is_format_supported(struct gbm_device *gbm,
                               uint32_t format, uint32_t flags)
{
   return gbm->v0.is_format_supported(gbm, format, flags);  // is_format_supported is null. it cause crash
}

I found that gbm_msm.c doesn't provide the relevant API functions (such as is_format_supported) when calling msm_device_create().

recipes-graphics/msm_be/files/0001-add-MSM-backend-with-xml-schema.patch
=> gbm/backends/msm/gbm_msm.c -> static struct gbm_device *msm_device_create()

I'm wondering if this is intentional, and if there are any plans to support it in the future.