Add libprocessgroup dependency and fix sched_policy include

libaudioclient and libmedia are using get_sched_policy and
set_sched_policy which are now implemented inside libprocessgroup.
Add required dependencies and include required headers.

Exempt-From-Owner-Approval: janitorial

Bug: 111307099
Test: builds, boots

Change-Id: I83dd6878839122e3ea71b7be6f6f312376897d56
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
diff --git a/media/libmedia/Android.bp b/media/libmedia/Android.bp
index 3efb5de..68dae56 100644
--- a/media/libmedia/Android.bp
+++ b/media/libmedia/Android.bp
@@ -213,6 +213,7 @@
         "android.hidl.token@1.0-utils",
         "liblog",
         "libcutils",
+        "libprocessgroup",
         "libutils",
         "libbinder",
         "libsonivox",