Make the trivial imx_soc_family() function an inline in imx_machdep.h.

The imx_machdep.c file is on the fast path to non-existance and this would
be the only thing left in it after some watchdog changes are completed.

sys/arm/freescale/imx/imx_machdep.c

@@ -105,10 +105,3 @@ imx_wdog_init_last_reset(vm_offset_t wdsr_phys)
 	}
 }
 
-u_int
-imx_soc_family(void)
-{
-	return (imx_soc_type() >> IMXSOC_FAMSHIFT);
-}
-
-

sys/arm/freescale/imx/imx_machdep.h

@@ -61,7 +61,12 @@ void imx_wdog_init_last_reset(vm_offset_t _wdsr_phys);
 #define	IMXSOC_FAMSHIFT	28
 
 u_int imx_soc_type(void);
-u_int imx_soc_family(void);
+
+static inline u_int
+imx_soc_family(void)
+{
+	return (imx_soc_type() >> IMXSOC_FAMSHIFT);
+}
 
 #endif