Add the common directory back to kernel headers.

This is a port of build/ change 6a2f28514.

Change-Id: I9128abf61a56e282f335f540fcf064dd52706b2b
diff --git a/cc/arm64_device.go b/cc/arm64_device.go
index dcdce0f..4e41287 100644
--- a/cc/arm64_device.go
+++ b/cc/arm64_device.go
@@ -103,6 +103,7 @@
 		"-isystem ${LibcRoot}/arch-arm64/include",
 		"-isystem ${LibcRoot}/include",
 		"-isystem ${LibcRoot}/kernel/uapi",
+		"-isystem ${LibcRoot}/kernel/common",
 		"-isystem ${LibcRoot}/kernel/uapi/asm-arm64",
 	}, " "))
 
diff --git a/cc/arm_device.go b/cc/arm_device.go
index 1b467da..d583590 100644
--- a/cc/arm_device.go
+++ b/cc/arm_device.go
@@ -172,6 +172,7 @@
 		"-isystem ${LibcRoot}/arch-arm/include",
 		"-isystem ${LibcRoot}/include",
 		"-isystem ${LibcRoot}/kernel/uapi",
+		"-isystem ${LibcRoot}/kernel/common",
 		"-isystem ${LibcRoot}/kernel/uapi/asm-arm",
 	}, " "))
 
diff --git a/cc/mips64_device.go b/cc/mips64_device.go
index 1bd6a3c..7cab09b 100644
--- a/cc/mips64_device.go
+++ b/cc/mips64_device.go
@@ -104,6 +104,7 @@
 		"-isystem ${LibcRoot}/arch-mips64/include",
 		"-isystem ${LibcRoot}/include",
 		"-isystem ${LibcRoot}/kernel/uapi",
+		"-isystem ${LibcRoot}/kernel/common",
 		"-isystem ${LibcRoot}/kernel/uapi/asm-mips",
 	}, " "))
 
diff --git a/cc/mips_device.go b/cc/mips_device.go
index 86e7dee..b2b2ccf 100644
--- a/cc/mips_device.go
+++ b/cc/mips_device.go
@@ -140,6 +140,7 @@
 		"-isystem ${LibcRoot}/arch-mips/include",
 		"-isystem ${LibcRoot}/include",
 		"-isystem ${LibcRoot}/kernel/uapi",
+		"-isystem ${LibcRoot}/kernel/common",
 		"-isystem ${LibcRoot}/kernel/uapi/asm-mips",
 	}, " "))
 
diff --git a/cc/x86_64_device.go b/cc/x86_64_device.go
index 65c7c00..9a0d663 100644
--- a/cc/x86_64_device.go
+++ b/cc/x86_64_device.go
@@ -152,6 +152,7 @@
 		"-isystem ${LibcRoot}/arch-x86_64/include",
 		"-isystem ${LibcRoot}/include",
 		"-isystem ${LibcRoot}/kernel/uapi",
+		"-isystem ${LibcRoot}/kernel/common",
 		"-isystem ${LibcRoot}/kernel/uapi/asm-x86",
 	}, " "))
 
diff --git a/cc/x86_device.go b/cc/x86_device.go
index d0bd8a0..e47c6fb 100644
--- a/cc/x86_device.go
+++ b/cc/x86_device.go
@@ -171,6 +171,7 @@
 		"-isystem ${LibcRoot}/arch-x86/include",
 		"-isystem ${LibcRoot}/include",
 		"-isystem ${LibcRoot}/kernel/uapi",
+		"-isystem ${LibcRoot}/kernel/common",
 		"-isystem ${LibcRoot}/kernel/uapi/asm-x86",
 	}, " "))