wiseconnect: Fix conflict with macro TIMERS

Wiseconnect define the "TIMERS" macro. This causes failures during
Zephyr compilation. However "TIMERS" symbol is not use by Wiseconnect,
so it can be safely removed.

wiseconnect/components/device/silabs/si91x/mcu/core/chip/inc/si91x_device.h

@@ -15953,7 +15953,6 @@ typedef struct { /*!< (@ 0x24042400) SDC Structure
 #define GPDMA_G           ((GPDMA_G_Type *)GPDMA_G_BASE)
 #define GPDMA_C           ((GPDMA_C_Type *)GPDMA_C_BASE)
 #define HWRNG             ((HWRNG_Type *)HWRNG_BASE)
-#define TIMERS            ((TIMERS_Type *)TIMERS_BASE)
 #define QEI               ((QEI_Type *)QEI_BASE)
 #define USART0            ((USART0_Type *)USART0_BASE)
 #define UART0             ((USART0_Type *)UART0_BASE)