kernel: bump 4.19 to 4.19.88

Refreshed all patches.

Remove upstreamed:
- 0004-boot-sq201-from-sda1.patch
- 500-v4.20-ubifs-Fix-default-compression-selection-in-ubifs.patch
- 0003-usb-dwc2-use-a-longer-core-rest-timeout-in-dwc2_core.patch

Altered patches:
- 0011-ARM-dts-Fix-up-SQ201-flash-access.patch
- 400-mtd-add-rootfs-split-support.patch
- 0101-pci-mediatek-backport-fix-pcie.patch

Compile-tested on: cns3xxx
Runtime-tested on: cns3xxx

Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com>

target/linux/generic/pending-4.19/400-mtd-add-rootfs-split-support.patch

@@ -59,15 +59,15 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  /*
   * Given a pointer to the MTD object in the mtd_part structure, we can retrieve
   * the pointer to that structure.
-@@ -623,6 +627,7 @@ int mtd_add_partition(struct mtd_info *p
- 	mutex_unlock(&mtd_partitions_mutex);
+@@ -626,6 +630,7 @@ int mtd_add_partition(struct mtd_info *p
+ 	if (ret)
+ 		goto err_remove_part;
  
- 	add_mtd_device(&new->mtd);
 +	mtd_partition_split(parent, new);
- 
  	mtd_add_partition_attrs(new);
  
-@@ -701,6 +706,29 @@ int mtd_del_partition(struct mtd_info *m
+ 	return 0;
+@@ -712,6 +717,29 @@ int mtd_del_partition(struct mtd_info *m
  }
  EXPORT_SYMBOL_GPL(mtd_del_partition);
  
@@ -97,10 +97,10 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  /*
   * This function, given a master MTD object and a partition table, creates
   * and registers slave MTD objects which are bound to the master according to
-@@ -732,6 +760,7 @@ int add_mtd_partitions(struct mtd_info *
- 		mutex_unlock(&mtd_partitions_mutex);
+@@ -752,6 +780,7 @@ int add_mtd_partitions(struct mtd_info *
+ 			goto err_del_partitions;
+ 		}
  
- 		add_mtd_device(&slave->mtd);
 +		mtd_partition_split(master, slave);
  		mtd_add_partition_attrs(slave);
  		/* Look for subpartitions */