DPMS: allow getPasswordMinimumMetrics() to anyone who can set LSKF

Everyone who sets a new LSKF is supposed to first validate it against
the minimum password metrics.  Yet, the
SET_AND_VERIFY_LOCKSCREEN_CREDENTIALS or ACCESS_KEYGUARD_SECURE_STORAGE
permission is sufficient to set a new LSKF but isn't necessarily
sufficient to get the minimum password metrics.  This is preventing
'KeyguardManager#setLock(int, byte[], int, byte[])' from being fixed to
properly validate the new LSKF.

To fix this, make DevicePolicyManagerService#getPasswordMinimumMetrics()
accept these permissions.

Bug: 219511761
Bug: 232900169
Bug: 243881358
Test: see I46d8bf920526a00d6e6d2145d06c8e39f8047ea8
Change-Id: Ic69fd01dadf95ab49b025295711fa020180690ff
Merged-In: Ic69fd01dadf95ab49b025295711fa020180690ff
(cherry picked from commit 62dbf253)