boards: rm1xx_dvk: Update outdated link

This commit updates the outdated link to MCP23S08 datasheet.

Signed-off-by: Stephanos Ioannidis <[email protected]>

Author: stephanosio

boards/arm/rm1xx_dvk/doc/index.rst

@@ -176,4 +176,4 @@ References
 .. _Nordic Semiconductor Infocenter: https://infocenter.nordicsemi.com
 .. _Adesto AT25DF041B datasheet: https://www.dialog-semiconductor.com/sites/default/files/ds-at25df041b_040.pdf
 .. _Semtech SX1272 datasheet: https://semtech.my.salesforce.com/sfc/p/#E0000000JelG/a/440000001NCE/v_VBhk1IolDgxwwnOpcS_vTFxPfSEPQbuneK3mWsXlU
-.. _Microchip MCP23S08 datasheet: https://www.microchip.com/content/dam/mchp/documents/OTH/ProductDocuments/DataSheets/MCP23008-MCP23S08-Data-Sheet-20001919F.pdf
+.. _Microchip MCP23S08 datasheet: https://ww1.microchip.com/downloads/en/DeviceDoc/MCP23008-MCP23S08-Data-Sheet-20001919F.pdf