Blackfin arch: add TWIx_REGBASE and SPIx_REGBASE to specific CPU header files, use the new REGBASE for board platform resources

Signed-off-by: Bryan Wu <bryan.wu@analog.com>

diff --git a/include/asm-blackfin/mach-bf537/defBF534.h b/include/asm-blackfin/mach-bf537/defBF534.h
index dce4c54..d0d80d3 100644
--- a/include/asm-blackfin/mach-bf537/defBF534.h
+++ b/include/asm-blackfin/mach-bf537/defBF534.h
@@ -86,6 +86,7 @@
 #define UART0_GCTL			0xFFC00424	/* Global Control Register                                      */
 
 /* SPI Controller			(0xFFC00500 - 0xFFC005FF)								*/
+#define SPI0_REGBASE			0xFFC00500
 #define SPI_CTL				0xFFC00500	/* SPI Control Register                                         */
 #define SPI_FLG				0xFFC00504	/* SPI Flag register                                            */
 #define SPI_STAT			0xFFC00508	/* SPI Status register                                          */
@@ -456,6 +457,7 @@
 #define PPI_FRAME			0xFFC01010	/* PPI Frame Length Register    */
 
 /* Two-Wire Interface		(0xFFC01400 - 0xFFC014FF)								*/
+#define TWI0_REGBASE			0xFFC01400
 #define TWI_CLKDIV			0xFFC01400	/* Serial Clock Divider Register                        */
 #define TWI_CONTROL			0xFFC01404	/* TWI Control Register                                         */
 #define TWI_SLAVE_CTL		0xFFC01408	/* Slave Mode Control Register                          */