mtd-utils: Drop version override

oe-core/dunfell now contains the following two commits updating
mtd-utils to 2.1.3, drop the override from here, since it also
triggers yocto-check-layer and oelint-adv errors:

  721a0e475d ("mtd-utils: upgrade 2.1.1 -> 2.1.2")
  809b3a22a5 ("mtd-utils: upgrade 2.1.2 -> 2.1.3")
Signed-off-by: Marek Vasut <marex@denx.de>

recipes-devtools/mtd/mtd-utils_%.bbappend

@@ -2,10 +2,6 @@ FILESEXTRAPATHS_prepend := "${THISDIR}/files:"
 
 FILES_${PN}-staticdev += "ubi-utils/libubi.a ${libdir}/*.a"
 
-SRCREV = "7b986779342021bda87c04da3bf729718736d8ab"
-SRC_URI = "git://git.infradead.org/mtd-utils.git"
-PV = "2.1.2"
-
 PACKAGECONFIG[zstd] = "--with-zstd,--without-zstd,zstd"
 PACKAGECONFIG_remove = "zstd"