sunxi: a133: dram: Align parameters terminology with Allwinner

There is a mistmatch between Allwinner's dram_para BSP definitions and the
parameters names in mainline u-boot for TPR1-3. What we call TPR1 is actually
MR22 while TPR2 is TPR0 and TPR3 is TPR1. MR22 does get written to the
corresponding register. This only concerns LPDDR4 support.

Introduce a new Kconfig entry for MR22 and proceed with the rename.
Update the only config currently using it.

See the list of parameters from the Allwinner BSP at the end of:
https://linux-sunxi.org/A133/DRAMC

Note that the H616/H6 code is coherent with this new TPR0 definition
(and does not use TPR1 and MR22).

Signed-off-by: Paul Kocialkowski <[email protected]>
Sponsored-by: MEC Electronics GmbH <https://www.mec.at/>
Acked-by: Jernej Skrabec <[email protected]>

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