capsule: add the generated capsules to gitignore

The sandbox platform build now generates a set of capsules. Put the
related files generated into gitignore.

Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org>
diff --git a/.gitignore b/.gitignore
index d9a64d7..be13704 100644
--- a/.gitignore
+++ b/.gitignore
@@ -64,6 +64,9 @@
 /tpl/
 /defconfig
 /generated_defconfig
+/Test*
+/capsule.*.efi-capsule
+/capsule*.map
 
 #
 # Generated include files