[PATCH] ARM: dts: am43xx: Fix inverted DS0_PULL_UP_DOWN_EN macro

* Dave Gerlach [off-list ref] [171213 13:27]:

Due to a mistake in documentation the DS0_PULL_UP_DOWN_EN macro was
mistakenly defined as an active high bit, however setting the bit
actually disables the internal pull resistor on the pin, so correct this
macro and introduce a new DS0_PULL_UP_DOWN_DIS macro with the proper bit
value set now that the documentation has been updated.

Change based on AM437x Techninal Reference Manual SPRUHL7G Revised June
2017 Section 7.2.1.

Applying into omap-for-v4.16/dt thanks,

Tony