efi_loader: use predefined constants in crt0_*_efi.S

We should use predefined constants instead of magic numbers.

Move some constant definitions from include/pe.h to
include/asm-generic/pe.h.

Use these constants in crt0_*_efi.S.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/include/asm-generic/pe.h b/include/asm-generic/pe.h
index faae534..b247519 100644
--- a/include/asm-generic/pe.h
+++ b/include/asm-generic/pe.h
@@ -29,6 +29,22 @@
 #define IMAGE_FILE_UP_SYSTEM_ONLY		0x4000
 #define IMAGE_FILE_BYTES_REVERSED_HI		0x8000
 
+/* Machine types */
+#define IMAGE_FILE_MACHINE_I386			0x014c
+#define IMAGE_FILE_MACHINE_ARM			0x01c0
+#define IMAGE_FILE_MACHINE_THUMB		0x01c2
+#define IMAGE_FILE_MACHINE_ARMNT		0x01c4
+#define IMAGE_FILE_MACHINE_AMD64		0x8664
+#define IMAGE_FILE_MACHINE_ARM64		0xaa64
+#define IMAGE_FILE_MACHINE_RISCV32		0x5032
+#define IMAGE_FILE_MACHINE_RISCV64		0x5064
+
+/* Header magic constants */
+#define IMAGE_NT_OPTIONAL_HDR32_MAGIC		0x010b
+#define IMAGE_NT_OPTIONAL_HDR64_MAGIC		0x020b
+#define IMAGE_DOS_SIGNATURE			0x5a4d     /* MZ   */
+#define IMAGE_NT_SIGNATURE			0x00004550 /* PE00 */
+
 /* Subsystem type */
 #define IMAGE_SUBSYSTEM_EFI_APPLICATION		10
 #define IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER	11