init: remove open, read, write access to 'sysfs' type.

Add write access to:
sysfs_android_usb
sysfs_leds
sysfs_power
sysfs_zram

Add setattr access to:
sysfs_android_usb
sysfs_devices_system_cpu
sysfs_lowmemorykiller
sysfs_power
sysfs_leds
sysfs_ipv4

Bug: 70040773
Bug: 65643247
Change-Id: I68e2e796f5599c9d281897759c8d8eef9363559a
Test: walleye boots with no denials from init to sysfs.
diff --git a/private/genfs_contexts b/private/genfs_contexts
index b76b145..dbff467 100644
--- a/private/genfs_contexts
+++ b/private/genfs_contexts
@@ -101,6 +101,7 @@
 genfscon sysfs /devices/virtual/switch          u:object_r:sysfs_switch:s0
 genfscon sysfs /firmware/devicetree/base/firmware/android u:object_r:sysfs_dt_firmware_android:s0
 genfscon sysfs /fs/ext4/features                  u:object_r:sysfs_fs_ext4_features:s0
+genfscon sysfs /power/autosleep u:object_r:sysfs_power:s0
 genfscon sysfs /power/state u:object_r:sysfs_power:s0
 genfscon sysfs /power/wakeup_count u:object_r:sysfs_power:s0
 genfscon sysfs /power/wake_lock u:object_r:sysfs_wake_lock:s0