Add MIT license tag to Pi-AHI header and source files

platforms/amiga/ahi/ahi_driver_amiga/pi-ahi.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 
 #include <exec/exec.h>
 

platforms/amiga/ahi/ahi_driver_amiga/pi-ahi.h

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 struct pi_ahi {
 	struct Task *t_master;
 	struct Library *ahi_base;

platforms/amiga/ahi/pi-ahi-enums.h

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 #define PI_AHI_OFFSET   0x88000000
 #define PI_AHI_REGSIZE  0x00010000
 #define PI_AHI_UPPER    0x8A000000

platforms/amiga/ahi/pi_ahi.h

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 #define AHIST_M8S		0
 #define AHIST_M16S		1
 #define AHIST_S8S		2