nyx: bpmp: automatically find best clock for t210

There were 4 reports of Nyx hanging or UMS and backup verification failing because of low binned Erista SoC.

This change reduces clock for hekate main and Nyx will now automatically try and find a working one.
In case Nyx hangs it will reduce it on next inject.

If Nyx works and user still has issues with UMS/Verification, manually editing nyx.ini and setting `bpmpclock=2` will fix that.

README.md

@@ -70,7 +70,7 @@ You can find a template [Here](./res/hekate_ipl_template.ini)
 | verification=1     | 0: Disable Backup/Restore verification, 1: Sparse (block based, fast and mostly reliable), 2: Full (sha256 based, slow and 100% reliable). |
 | umsemmcrw=0        | 1: eMMC/emuMMC UMS will be mounted as writable by default. |
 | jcdisable=0        | 1: Disables Joycon driver completely.                      |
-| newpowersave=1     | 0: Timer based, 1: DRAM frequency based (Better). Use 0 if Nyx hangs. |
+| bpmpclock=1        | 0: Auto, 1: Faster, 2: Fast. Use 2 if Nyx hangs or some functions like UMS/Backup Verification fail. |
 
 
 ### Boot entry key/value combinations: