soc_caps.h: remove spi cap that is defined to 0

According to the caps rule, for unsupported feature we don't define anything. 

Remove the define 0 that violates this rule.

components/soc/esp32/include/soc/soc_caps.h

@@ -186,9 +186,6 @@
 // Peripheral supports DIO, DOUT, QIO, or QOUT
 #define SOC_SPI_PERIPH_SUPPORT_MULTILINE_MODE(spi_host)         ({(void)spi_host; 1;})
 
-// Peripheral doesn't support output given level during its "dummy phase"
-#define SOC_SPI_PERIPH_SUPPORT_CONTROL_DUMMY_OUTPUT             0
-
 /*-------------------------- TIMER GROUP CAPS --------------------------------*/
 #define SOC_TIMER_GROUP_COUNTER_BIT_WIDTH  (64)
 #define SOC_TIMER_GROUP_PRESCALE_BIT_WIDTH (16)