linux-mister-5.15-3: Fix rootfs filesystems

Looks like exfat was too eager to be the main rootfs filesystem, so
it just messed with everyone else. ext4 was fine, but btrfs wasn't.

Change CONFIG_EXFAT_FS to a module, since it can easily load it later
given that our rootfs is specifically not exfat.

BUG=Issue #1
TEST=/dev/mmcblk0p3 rootfs is btrfs

linux-mister/PKGBUILD

@@ -8,7 +8,7 @@ pkgbase=linux-mister
 _kernelname=${pkgbase#linux}
 _desc="MiSTer"
 pkgver=5.15
-pkgrel=2
+pkgrel=3
 arch=('armv7h')
 url="https://github.com/MiSTer-devel/Linux-Kernel_MiSTer"
 license=('GPL2')
@@ -21,7 +21,7 @@ source=("https://github.com/MiSTer-devel/Linux-Kernel_MiSTer/archive/e503d193c40
         'config')
 sha256sums=('c611e3753b4333e43569380f83c3590f619b27ab30a21ad302b3e290946e6582'
             'ae2e95db94ef7176207c690224169594d49445e04249d2499e9d2fbc117a0b21'
-            '2c2cf2e8dc9a3fb4b32e8556267e0fd1cf1b9e20f4128e56121a1f7b94c0d87d')
+            'f56135ae67dc3eac1a64227289890d8cc6c670569d656ca018299945e5fe3bc4')
 
 prepare() {
   cd "${srcdir}/${_srcname}"

linux-mister/config

@@ -1,6 +1,6 @@
 #
 # Automatically generated file; DO NOT EDIT.
-# Linux/arm 5.15.1-1 Kernel Configuration
+# Linux/arm 5.15.1-3 Kernel Configuration
 #
 CONFIG_CC_VERSION_TEXT="gcc (crosstool-NG 1.23.0.418-d590) 10.2.0"
 CONFIG_CC_IS_GCC=y
@@ -3482,7 +3482,7 @@ CONFIG_VFAT_FS=y
 CONFIG_FAT_DEFAULT_CODEPAGE=437
 CONFIG_FAT_DEFAULT_IOCHARSET="iso8859-1"
 # CONFIG_FAT_DEFAULT_UTF8 is not set
-CONFIG_EXFAT_FS=y
+CONFIG_EXFAT_FS=m
 CONFIG_EXFAT_DISCARD=y
 CONFIG_EXFAT_DELAYED_SYNC=y
 # CONFIG_EXFAT_KERNEL_DEBUG is not set