efi: Export symbol efi_mem_desc_lookup

Building efidrm as module requires efi_mem_desc_lookup(). Export
the symbol.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://lore.kernel.org/r/20250408091837.407401-2-tzimmermann@suse.de

Author: tdz

drivers/firmware/efi/efi.c

@@ -558,6 +558,7 @@ int __efi_mem_desc_lookup(u64 phys_addr, efi_memory_desc_t *out_md)
 
 extern int efi_mem_desc_lookup(u64 phys_addr, efi_memory_desc_t *out_md)
 	__weak __alias(__efi_mem_desc_lookup);
+EXPORT_SYMBOL_GPL(efi_mem_desc_lookup);
 
 /*
  * Calculate the highest address of an efi memory descriptor.