ARM: dts: at91: sama7g5: fix clock id for ebi node

The PMC_MCK1 clock id for the ebi node is 23.

Fixes: 746b7382 ("ARM: dts: at91: sama7g5/sama7g5ek: align with Linux DT")
Reviewed-by: Eugen Hristev <eugen.hristev@collabora.com>
Signed-off-by: Mihai Sain <mihai.sain@microchip.com>