[gbl] Refactor GblEfiFastbootTransport RX mode to use EFI_ENUM

Convert legacy GblEfiFastbootRxMode typedef enum to EFI_ENUM.

TAG=agy
CONV=236c2e4e-69e4-48b6-a8ea-8986bc68bb04

Change-Id: I31537f25e4a70a145cdd77dd8c8376fad8142f5d
Reviewed-on: https://turquoise-internal-review.googlesource.com/c/third_party/u-boot/+/1373931
Commit-Queue: Sergii Parubochyi <sergiip@google.com>
Reviewed-by: Dov Shlachter <dovs@google.com>
GitOrigin-RevId: 52260b5de8fb51d42cea00e8856ee270d112b721

include/gbl_efi_fastboot_transport.h

diff --git a/include/gbl_efi_fastboot_transport.h b/include/gbl_efi_fastboot_transport.h
index 30dd62c..9fbcbf8 100644
--- a/include/gbl_efi_fastboot_transport.h
+++ b/include/gbl_efi_fastboot_transport.h
@@ -13,10 +13,9 @@
 	EFI_GUID(0xedade92c, 0x5c48, 0x440d, 0x84, 0x9c, 0xe2, 0xa0, 0xc7, \
 		 0xe5, 0x51, 0x43)
 
-typedef enum GBL_EFI_FASTBOOT_RX_MODE {
+EFI_ENUM(GblEfiFastbootRxMode, uint32_t,
 	SINGLE_PACKET = 0,
-	FIXED_LENGTH,
-} GblEfiFastbootRxMode;
+	FIXED_LENGTH);
 
 typedef struct GblEfiFastbootTransportProtocol {
 	uint64_t revision;