kernel: Move to Linux v5.4.7-openpower1

This picks up a buildroot commit to support Linux 5.4.

Drop the firmware assisted dump (FAdump) patches as they are now
merged upstream. Also drop the lpfc fixes as they are upsteam too.

Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/openpower/configs/pseries_defconfig b/openpower/configs/pseries_defconfig
index 613ed36..4eaceca 100644
--- a/openpower/configs/pseries_defconfig
+++ b/openpower/configs/pseries_defconfig
@@ -15,7 +15,7 @@
 BR2_ROOTFS_POST_BUILD_SCRIPT="../openpower/scripts/fixup-target-var ../openpower/scripts/firmware-whitelist"
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_VERSION=y
-BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.3.18"
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.4.7"
 BR2_LINUX_KERNEL_PATCH="$(BR2_EXTERNAL_OP_BUILD_PATH)/linux"
 BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
 BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="$(BR2_EXTERNAL_OP_BUILD_PATH)/configs/linux/pseries_skiroot_defconfig"