ARM: dts: aspeed: bletchley: add pca9536 node on each sled

Add an ioexp node on each sled baseed on DVT schematic, address at 0x41.

P0: SLEDX_SWD_MUX
P1: SLEDX_XRES_SWD_N
P2: SLEDX_CLKREQ_N
P3: SLEDX_PCIE_PWR_EN

Signed-off-by: Potin Lai <potin.lai.pt@gmail.com>
Reviewed-by: Patrick Williams <patrick@stwcx.xyz>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Link: https://lore.kernel.org/r/20220509151118.4899-6-potin.lai.pt@gmail.com


Signed-off-by: Joel Stanley <joel@jms.id.au>