ARM: dts: am335x-baltos: update MPU regulator range

Update the max MPU voltage range to align with the maximum
possible value allowed in the operating-points table, which is max
target voltage of 132500 uV + 2%.

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Message-Id: <20220419143923.25196-1-yegorslists@googlemail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>