ffmpeg: backport patch to fix errors with GCC 14

ffmpeg: backport patch to fix errors with GCC 14

On ARMv7 compilation of ffmpeg breaks if Vulkan support is enabled.
Backport a patch from the trunk to fix compilation issues:

| src/libavcodec/vulkan_av1.c: In function 'vk_av1_create_params':
| src/libavcodec/vulkan_av1.c:214:43: error: initialization of 'long long unsigned int' from 'void *' makes integer from pointer without a cast [-Wint-conversion]
|   214 |         .videoSessionParametersTemplate = NULL,
|       |                                           ^~~~
| src/libavcodec/vulkan_av1.c:214:43: note: (near initialization for '(anonymous).videoSessionParametersTemplate')
| make: *** [/oe/build/tmp-rpb_wayland-glibc/work/armv7at2hf-neon-linaro-linux-gnueabi/ffmpeg/6.1.1/ffmpeg-6.1.1/ffbuild/common.mak:81: libavcodec/vulkan_av1.o] Error 1
| make: *** Waiting for unfinished jobs....
| src/libavcodec/vulkan_decode.c: In function 'ff_vk_decode_prepare_frame':
| src/libavcodec/vulkan_decode.c:191:26: error: assignment to 'VkImageView' {aka 'long long unsigned int'} from 'void *' makes integer from pointer without a cast [-Wint-conversion]
|   191 |     vkpic->img_view_ref  = NULL;
|       |                          ^
| src/libavcodec/vulkan_decode.c:192:26: error: assignment to 'VkImageView' {aka 'long long unsigned int'} from 'void *' makes integer from pointer without a cast [-Wint-conversion]
|   192 |     vkpic->img_view_out  = NULL;
|       |                          ^
| src/libavcodec/vulkan_decode.c:193:26: error: assignment to 'VkImageView' {aka 'long long unsigned int'} from 'void *' makes integer from pointer without a cast [-Wint-conversion]
|   193 |     vkpic->img_view_dest = NULL;
|       |                          ^
| make: *** [/oe/build/tmp-rpb_wayland-glibc/work/armv7at2hf-neon-linaro-linux-gnueabi/ffmpeg/6.1.1/ffmpeg-6.1.1/ffbuild/common.mak:81: libavcodec/vulkan_decode.o] Error 1

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>