Fix new_root UUID not found error

[LukeShortCloud]

Copied from the release notes for 2.1.0:

---

KNOWN ISSUES

On some storage devices, users have reported seeing an error on boot similar to this:

ERROR: device 'UUID=<UUID>' not found. Skipping fsck.
mount: /new_root: can't find UUID=<UUID>.
You are now being dropped into an emergency shell.

As a workaround, once you get to the GNU GRUB version 2.06~1~manjaro menu go to Advanced options for Manjaro Linux and then select Manjaro Linux (Kernel: 5.10.41-1-MANJARO x64 - fallback initramfs). This has more device storage drivers enabled by default.

[LukeShortCloud]

I have tested and confirmed the long-term fix:

"Before creating the initial RAM disk, in /etc/mkinitcpio.conf move the block and keyboard hooks before the autodetect hook." - https://wiki.archlinux.org/title/Install_Arch_Linux_on_a_removable_medium

Two other things to note:

1. Depending on how many people this affects, we may want to release 2.1.1 with the fix or at least provide an easy way to run the upgrade script to fix it.
2. We may no longer need to pin the Linux 5.10 kernel to an older release. It may have been by pure chance that booting happened to only work with an older kernel. Related: MacBook Pro 16" 2019 bug does not boot #79

[LukeShortCloud]

File: /etc/mkinitcpio.conf

Before (original, default install of Manjaro):

HOOKS=(base udev autodetect modconf block filesystems keyboard fsck)

After:

HOOKS=(base udev block keyboard autodetect modconf filesystems fsck)