system-arm: Rename ARM bootloader directories

The patch is renaming:

system/arm/simple_bootloader -> system/arm/bootloader/arm
system/arm/aarch64_bootloader -> system/arm/bootloader/arm64

Change-Id: Ia7380be3914e277624060f1c96361a0f16dbea9d
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Adrian Herrera <adrian.herrera@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/23948
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>

.gitignore

@@ -21,10 +21,10 @@ m5out
 /util/term/m5term
 /system/arm/dt/*.dtb
 /system/arm/dt/.gen
-/system/arm/simple_bootloader/*.o
-/system/arm/simple_bootloader/boot.arm
-/system/arm/simple_bootloader/boot_emm.arm
-/system/arm/aarch64_bootloader/*.o
-/system/arm/aarch64_bootloader/boot.arm64
-/system/arm/aarch64_bootloader/boot_emm.arm64
-/system/arm/aarch64_bootloader/boot_v2.arm64
+/system/arm/bootloader/arm/*.o
+/system/arm/bootloader/arm/boot.arm
+/system/arm/bootloader/arm/boot_emm.arm
+/system/arm/bootloader/arm64/*.o
+/system/arm/bootloader/arm64/boot.arm64
+/system/arm/bootloader/arm64/boot_emm.arm64
+/system/arm/bootloader/arm64/boot_v2.arm64

util/gen_arm_fs_files.py

@@ -246,7 +246,7 @@ run_cmd("copy DTBs",
     ["cp"] + glob(dt_dir + "/*dtb") + [binaries_dir])
 
 # Build bootloaders arm64
-bootloader_arm64_dir = gem5_dir + "/system/arm/aarch64_bootloader"
+bootloader_arm64_dir = gem5_dir + "/system/arm/bootloader/arm64"
 run_cmd("compile arm64 bootloader",
     bootloader_arm64_dir,
     ["make"])
@@ -255,7 +255,7 @@ run_cmd("copy arm64 bootloader",
     ["cp", "boot.arm64", "boot_emm.arm64", "boot_v2.arm64", binaries_dir])
 
 # Build bootloaders arm
-bootloader_arm_dir = gem5_dir + "/system/arm/simple_bootloader"
+bootloader_arm_dir = gem5_dir + "/system/arm/bootloader/arm"
 run_cmd("compile arm bootloader",
     bootloader_arm_dir,
     ["make"])