misc: git ignore file udpated

Change-Id: Ib2c7a7d26e7121dd082ca55a7c7ccf53fc47572c
Reviewed-on: https://gem5-review.googlesource.com/4240
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Jason Lowe-Power <jason@lowepower.com>
diff --git a/.gitignore b/.gitignore
index 6bb759e..6f849bf 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,6 +6,7 @@
 *.pyc
 *~
 .*.swp
+.*.swo
 m5out
 /src/doxygen
 /ext/dramsim2/DRAMSim2
@@ -18,3 +19,7 @@
 /util/tap/m5tap
 /util/term/m5term
 /system/arm/dt/*.dtb
+/system/arm/simple_bootloader/*.o
+/system/arm/simple_bootloader/boot.arm
+/system/arm/simple_bootloader/boot_emm.arm
+/system/arm/aarch64_bootloader/boot_emm.arm64