[][mtd: spinand: winbond: add support for W25NxxKV series]

[Description]
Change part of commit 3d587bd9054bd2f3ce3dc4e5e46e7a190f3851eb.
Move nmbm related change directly to generic/files-5.4

[Release-log]
N/A

Change-Id: Ia2bbdac17891bff9cf7fa8b8036436249711f81d
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/5944439
diff --git a/target/linux/generic/files-5.4/drivers/mtd/nmbm/nmbm-core.c b/target/linux/generic/files-5.4/drivers/mtd/nmbm/nmbm-core.c
index 18dfb6a..b80ea42 100644
--- a/target/linux/generic/files-5.4/drivers/mtd/nmbm/nmbm-core.c
+++ b/target/linux/generic/files-5.4/drivers/mtd/nmbm/nmbm-core.c
@@ -2189,7 +2189,7 @@
 		return false;
 	}
 
-	if (!nld->oobsize || !is_power_of_2(nld->oobsize)) {
+	if (!nld->oobsize) {
 		nmbm_log_lower(nld, NMBM_LOG_ERR,
 			       "Page spare size %u is not valid\n", nld->oobsize);
 		return false;