vulkan/android: make vk_ahb_probe_format private to android runtime

...and drop duplicate docs.

Acked-by: Rob Clark <robclark@freedesktop.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36151>

src/vulkan/runtime/vk_android.c

@@ -635,12 +635,7 @@ vk_image_usage_to_ahb_usage(const VkImageCreateFlags vk_create,
    return ahb_usage;
 }
 
-/* Probe gralloc implementation to test whether it can allocate a buffer
- * for the given format and usage.  Vk drivers must not advertise support
- * for AHB backed VkImage's if the gralloc implementation is not able to
- * perform the allocation.
- */
-bool
+static bool
 vk_ahb_probe_format(VkFormat vk_format,
                     VkImageCreateFlags vk_create,
                     VkImageUsageFlags vk_usage)

src/vulkan/runtime/vk_android.h

@@ -92,10 +92,6 @@ uint32_t vk_image_format_to_ahb_format(VkFormat vk_format);
 uint64_t vk_image_usage_to_ahb_usage(const VkImageCreateFlags vk_create,
                                      const VkImageUsageFlags vk_usage);
 
-bool vk_ahb_probe_format(VkFormat vk_format,
-                         VkImageCreateFlags vk_create,
-                         VkImageUsageFlags vk_usage);
-
 struct AHardwareBuffer *vk_alloc_ahardware_buffer(
    const VkMemoryAllocateInfo *pAllocateInfo);
 
@@ -141,14 +137,6 @@ vk_image_usage_to_ahb_usage(const VkImageCreateFlags vk_create,
    return 0;
 }
 
-static inline bool
-vk_ahb_probe_format(VkFormat vk_format,
-                    VkImageCreateFlags vk_create,
-                    VkImageUsageFlags vk_usage)
-{
-   return false;
-}
-
 static inline struct AHardwareBuffer *
 vk_alloc_ahardware_buffer(const VkMemoryAllocateInfo *pAllocateInfo)
 {