vulkan: Allow global symbol HMI for Android

Android looks for this symbol when loading HAL modules.

Reviewed-by: Eric Engestrom <eric@engestrom.ch>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6112>
diff --git a/src/vulkan/vulkan-icd-symbols.txt b/src/vulkan/vulkan-icd-symbols.txt
index feca419..b463ca8 100644
--- a/src/vulkan/vulkan-icd-symbols.txt
+++ b/src/vulkan/vulkan-icd-symbols.txt
@@ -12,3 +12,8 @@
 # Version 4 - Add unknown physical device extension querying via
 #             vk_icdGetPhysicalDeviceProcAddr.
 (optional) vk_icdGetPhysicalDeviceProcAddr
+
+# Andoid looks for this global in HAL modules. In the source it occurs
+# as HAL_MODULE_INFO_SYM (which is just a #define for HMI) and it's an
+# instance of struct hwvulkan_module_t.
+(optional) HMI