dts: arm64: imx8mq-librem5: describe the battery with simple-battery

2 jobs for max-upstream in 61 minutes and 30 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #362697
librem5
build:aarch64

00:19:59

passed #362698
librem5:arm64
build:deb

01:01:28