Add /sys/kernel/memory_state_time to sysfs_power.

This allows system_server to access it for determining battery stats
(see KernelMemoryBandwidthStats.java).

batterystats-wo: type=1400 audit(0.0:429): avc: denied { read } for name="show_stat" dev="sysfs" ino=48071 scontext=u:r:system_server:s0 tcontext=u:object_r:sysfs:s0 tclass=file permissive=0

Bug: 72643420
Bug: 73947096

Test: Policy still builds.
Change-Id: I13945beff7ffe1fddd97e9c792826479849fecb1
diff --git a/sepolicy/genfs_contexts b/sepolicy/genfs_contexts
index 33ea628..bf0e65b 100644
--- a/sepolicy/genfs_contexts
+++ b/sepolicy/genfs_contexts
@@ -38,7 +38,6 @@
 genfscon sysfs /devices/soc/2080000.qcom,mss          u:object_r:sysfs_msm_subsys:s0
 genfscon sysfs /kernel/boot_adsp/boot                 u:object_r:sysfs_msm_subsys:s0
 genfscon sysfs /kernel/boot_slpi/boot                 u:object_r:sysfs_msm_subsys:s0
-genfscon sysfs /kernel/memory_state_time              u:object_r:sysfs_power:s0
 genfscon sysfs /devices/soc/600000.qcom,pcie          u:object_r:sysfs_pcie:s0
 genfscon sysfs /devices/soc/6a00000.ssusb/6a00000.dwc3/gadget/lun0/ u:object_r:sysfs_android_usb:s0
 genfscon sysfs /devices/soc/8c0000.qcom,msm-cam       u:object_r:sysfs_camera:s0