post-fs-data.sh: Create directories with mkdir -p

[hexdefined]

$mnt_dir was not created with mkdir -p, unlike $mnt_base. This caused the system-ca-certs module to only work for the first boot after it was enabled, since mkdir would fail on subsequent boots.

Log:

+ mod_dir=/data/adb/modules/system_ca_certs
+ module_prop id
+ grep '^id=' /data/adb/modules/system_ca_certs/module.prop
+ cut '-d=' -f2
+ module_id=system_ca_certs
+ apex_dir=/apex/com.android.conscrypt/cacerts
+ system_dir=/system/etc/security/cacerts
+ mnt_base=/data/adb/modules/system_ca_certs/mnt
+ mnt_index=0
+ mkdir -p /data/adb/modules/system_ca_certs/mnt
+ '[[' '!' -d /apex/com.android.conscrypt/cacerts ]]
+ mnt_dir=/data/adb/modules/system_ca_certs/mnt/0
+ let 'mnt_index+=1'
+ mkdir /data/adb/modules/system_ca_certs/mnt/0
mkdir: can't create directory '/data/adb/modules/system_ca_certs/mnt/0': File exists

[chenxiaolong]

Oof, that was a dumb oversight on my part.

Thanks for the PR!

[chenxiaolong]

The CI failing is unrelated to your change. It's due to a vulnerability in a dependency. I'll update the dependencies in a separate PR and then rebase this branch.

EDIT: "unrelated", not "related"