ANDROID: binder: add support for RT prio inheritance.

Adds support for SCHED_BATCH/SCHED_FIFO/SCHED_RR
priority inheritance.

Bug: 34461621
Bug: 37293077
Bug: 120446518
Change-Id: I71f356e476be2933713a0ecfa2cc31aa141e2dc6
Signed-off-by: Martijn Coenen <maco@google.com>
[AmitP: Include <uapi/linux/sched/types.h> for struct sched_param]
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
[astrachan: Folded the following changes into this patch:
            69308b3b07dd ("ANDROID: binder: add min sched_policy to node.")
            7a6edeb62d86 ("ANDROID: binder: improve priority inheritance.")
            22b061b17679 ("ANDROID: binder: don't check prio permissions on restore.")
            67cf97141d81 ("ANDROID: binder: Add tracing for binder priority inheritance.")
            fb92c34f7ba3 ("ANDROID: binder: add RT inheritance flag to node.")
            c847b48f8cda ("ANDROID: binder: init desired_prio.sched_policy before use it")]
Signed-off-by: Alistair Strachan <astrachan@google.com>