dt-bindings: nvmem: sl28cpld: Drop sa67mcu compatible

dt-bindings: nvmem: sl28cpld: Drop sa67mcu compatible

I was just informed that this product is discontinued (without being
ever released to the market). Pull the plug and let's not waste any more
maintainers time and revert commit 4a9b344e90c7 ("dt-bindings: nvmem:
sl28cpld: add sa67mcu compatible").

Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Michael Walle <mwalle@kernel.org>
Signed-off-by: Srinivas Kandagatla <srini@kernel.org>
Link: https://patch.msgid.link/20260327131751.3026030-4-srini@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>