drivers: nxp_enet: Correct PTP clock dependencies

The dependencies should be in a 'depends on' clause.
Also, 'depends on PTP_CLOCK' is redundant because this is
within 'if PTP_CLOCK' already.

Additionally, conditionally include the PTP header in the mac driver.

Signed-off-by: Declan Snyder <declan.snyder@nxp.com>

drivers/ptp_clock/Kconfig.nxp_enet

@@ -3,7 +3,7 @@
 
 config PTP_CLOCK_NXP_ENET
 	bool "NXP ENET PTP Clock driver"
-	default y if DT_HAS_NXP_ENET_PTP_CLOCK_ENABLED && \
-			(PTP_CLOCK || NET_L2_PTP)
+	default y
+	depends on DT_HAS_NXP_ENET_PTP_CLOCK_ENABLED && NET_L2_PTP
 	help
 	  Enable NXP ENET PTP clock support.

soc/nxp/imxrt/imxrt10xx/soc.c

@@ -64,7 +64,7 @@ const clock_enet_pll_config_t ethPllConfig = {
 	.enableClkOutput1 = true,
 #endif
 #endif
-#if defined(CONFIG_PTP_CLOCK_MCUX)
+#if defined(CONFIG_PTP_CLOCK_MCUX) || defined(CONFIG_PTP_CLOCK_NXP_ENET)
 	.enableClkOutput25M = true,
 #else
 	.enableClkOutput25M = false,

soc/nxp/imxrt/imxrt11xx/soc.c

@@ -437,7 +437,7 @@ static ALWAYS_INLINE void clock_init(void)
 #endif
 #endif
 
-#ifdef CONFIG_PTP_CLOCK_MCUX
+#if defined(CONFIG_PTP_CLOCK_MCUX) || defined(CONFIG_PTP_CLOCK_NXP_ENET)
 	/* 24MHz PTP clock */
 	rootCfg.mux = kCLOCK_ENET_TIMER1_ClockRoot_MuxOscRc48MDiv2;
 	rootCfg.div = 1;