arm: dts: k3-j721e-sk: EMIF tool update to 0.6.1 with 4266MTs for lpddr4

arm: dts: k3-j721e-sk: EMIF tool update to 0.6.1 with 4266MTs for lpddr4

EMIF tool for J721E SK is now updated to 0.6.1 that includes
* Updated write DQ training pattern to enable user pattern and clock
  pattern (from 0x7 to 0x6).
* Updated IO drive strength to 40-80-80 Ohms.

J721E SK uses the lpddr4 configuration of 4266 MTs data rate which is
the same as J721E EVM but facing random failures. As the tool update is
specific to the SK board, add a new lpddr4 config of 4266 MTs.

Signed-off-by: Kevin Scholz <k-scholz@ti.com>
Signed-off-by: Sinthu Raja <sinthu.raja@ti.com>