[beagleboard] IEP timer on PRUs on the Beaglebone AI and Beaglebone Black

I must have inadvertently set the CMP0_RST_CNT_EN bit on the COMPARE_CFG register on pr2. After setting that in the setup function, it works on both PRUs.

Does anyone know why the SR1.1 section is in the reference manual? Can the PRUs be configured to use SR1.1 over SR2.0?