[KERNEL32][KERNEL32_APITEST] Implement user-mode UEFI / Firmware API (#5149)

- Implement firmware environment variable read/write APIs
- Add, fix and improve related definitions and declarations
- Add kernel32:UEFIFirmware apitest

CORE-11954

sdk/include/xdk/extypes.h

@@ -346,3 +346,14 @@ $if (_NTIFS_)
 #define EX_PUSH_LOCK ULONG_PTR
 #define PEX_PUSH_LOCK PULONG_PTR
 $endif (_NTIFS_)
+
+$if (_WINNT_ || _WDMDDK_)
+#if (NTDDI_VERSION >= NTDDI_VISTA)
+typedef enum _FIRMWARE_TYPE {
+    FirmwareTypeUnknown,
+    FirmwareTypeBios,
+    FirmwareTypeUefi,
+    FirmwareTypeMax
+} FIRMWARE_TYPE, *PFIRMWARE_TYPE;
+#endif /* (NTDDI_VERSION >= NTDDI_VISTA) */
+$endif (_WINNT_ || _WDMDDK_)

sdk/include/xdk/winnt.template.h

@@ -73,6 +73,7 @@ $define(UCHAR=BYTE)
 $include(ntbasedef.h)
 $include(interlocked.h)
 $include(ketypes.h)
+$include(extypes.h)
 $include(winnt_old.h)
 
 #ifdef __cplusplus