board: nxp: vid: introduce PMBus framework support

Wire board/nxp/common/vid.c into the <pmbus.h> framework so the legacy
NXP AVS path stops carrying its own duplicate copy of the PMBus
protocol and instead consumes the shared constants, decoders, and
transport helpers.

vid.c is the legacy NXP AVS/pre-kernel voltage-trim path for lx2160 CPUs.
It does PMBus to whichever core-rail voltage monitor the board carries:
LTC3882 or ISL68233 are selected with
CONFIG_VOL_MONITOR_LTC3882_*/CONFIG_VOL_MONITOR_ISL68233_*.

Before this change the file kept its own local PMBUS_CMD_* command-code
defines, its own inline LINEAR16 mantissa/exponent math, and called
into I2C through the I2C_READ/I2C_WRITE NXP wrappers in
board/nxp/common/i2c_common.{c,h} which is a parallel implementation of
exactly what <pmbus.h> + lib/pmbus.c provides.

The intent is to make vid.c an consumer of the new PMBus.

Compatibility with the former support:

  - CLI unchanged: vdd_override and vdd_read keep their existing
    semantics, return codes, and diagnostic output.

  - I2C transport unchanged on the wire: the framework's pmbus_*
    helpers call dm_i2c_read/dm_i2c_write: the same DM I2C
    backing that vid.c's former I2C_READ/I2C_WRITE macros already
    routed through on DM_I2C.

  - Numeric decode is bit-equivalent: pmbus_reg2data_linear16() and
    pmbus_data2reg_linear16() implement the PMBus 1.3 Part II
    mantissa/exponent.

Signed-off-by: Vincent Jardin <[email protected]>
Signed-off-by: Peng Fan <[email protected]>

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