soc: nxp: imxrt11xx: only set CONFIG_CPU_HAS_FPU_DOUBLE_PRECISION for M7

Only set CONFIG_CPU_HAS_FPU_DOUBLE_PRECISION for Cortex M7 cores, as the
M4 core on iMXRT11xx parts does have a double precision FPU

Signed-off-by: Daniel DeGrasse <daniel.degrasse@nxp.com>

soc/nxp/imxrt/imxrt11xx/Kconfig

@@ -28,7 +28,8 @@ config SOC_SERIES_IMXRT11XX
 	select HAS_MCUX_EDMA
 	select CPU_HAS_ICACHE if CPU_CORTEX_M7
 	select CPU_HAS_DCACHE if CPU_CORTEX_M7
-	select CPU_HAS_FPU_DOUBLE_PRECISION
+	select CPU_HAS_FPU
+	select CPU_HAS_FPU_DOUBLE_PRECISION if CPU_CORTEX_M7
 	select BYPASS_LDO_LPSR
 	select ADJUST_LDO
 	select HAS_MCUX_PWM