Increase goma -j 80 -> 150 for 2 android debug CQ builders

This cl increases build parallelism for
* android_arm64_dbg_recipe
* android_clang_dbg_recipe

These builders have slow compile step time like below builds.
* android_arm64_dbg_recipe
5935s https://ci.chromium.org/b/8942150764225931712
5163s https://ci.chromium.org/b/8942367352394832112
4696s https://ci.chromium.org/b/8942146814412549072

* android_clang_dbg_recipe
4257s https://ci.chromium.org/b/8942150764225931424
4102s https://ci.chromium.org/b/8942346357249144704
3984s https://ci.chromium.org/b/8942146814412548848

Bug: 804251
Change-Id: I2daa9d8e86bbee4c990e3518a7c0300754d42859
Reviewed-on: https://chromium-review.googlesource.com/1122062
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572092}

infra/config/global/cr-buildbucket.cfg

@@ -2347,6 +2347,7 @@ buckets {
     }
     builders {
       mixins: "android-try"
+      mixins: "goma-j150"
       name: "android_arm64_dbg_recipe"
       dimensions: "os:Ubuntu-14.04"
     }
@@ -2360,6 +2361,7 @@ buckets {
     }
     builders {
       mixins: "android-try"
+      mixins: "goma-j150"
       name: "android_clang_dbg_recipe"
       dimensions: "os:Ubuntu-14.04"
     }