linux-raspberrypi_5.4.bb: Enable powersave options in kconfig

Will let system hibernate and suspend, its initial setup, there is more
work needed to get it going fully without problems in userspace, which
will follow

Signed-off-by: Khem Raj <raj.khem@gmail.com>

recipes-kernel/linux/files/powersave.cfg

@@ -0,0 +1,13 @@
+CONFIG_SUSPEND=y
+CONFIG_SUSPEND_FREEZER=y
+CONFIG_HIBERNATE_CALLBACKS=y
+CONFIG_HIBERNATION=y
+CONFIG_PM_STD_PARTITION="/dev/mmcblk0p2"
+CONFIG_PM_SLEEP=y
+CONFIG_PM_SLEEP_SMP=y
+CONFIG_PM_AUTOSLEEP=y
+CONFIG_PM_WAKELOCKS=y
+CONFIG_PM_WAKELOCKS_LIMIT=100
+CONFIG_PM_WAKELOCKS_GC=y
+CONFIG_PM_GENERIC_DOMAINS_SLEEP=y
+CONFIG_ARCH_HIBERNATION_HEADER=y

recipes-kernel/linux/linux-raspberrypi_5.4.bb

@@ -6,4 +6,5 @@ SRCREV = "5c08b6e79a8bfa1e59bb0004a1c94ed902a6d615"
 require linux-raspberrypi_5.4.inc
 
 SRC_URI += "file://0001-perf-Make-perf-able-to-build-with-latest-libbfd.patch \
+            file://powersave.cfg \
            "