drivers/intel/mipi_camera: Add macros to increase code readability

This will be used to pass information to driver through ACPI in devicetree.
Example https://review.coreboot.org/c/coreboot/+/52013

register "clk_panel.clks[0].clknum" = "IMGCLKOUT_3"
register "clk_panel.clks[0].freq" = "FREQ_19_2_MHZ"

TEST=Add these macros in devicetree, build and check static.c for consistency

Signed-off-by: Varshit B Pandya <varshit.b.pandya@intel.corp-partner.google.com>
Change-Id: Ia4137e09c934bf06857ceedb933e616bed5070dd
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55097
Reviewed-by: Maulik V Vaghela <maulik.v.vaghela@intel.com>
Reviewed-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Reviewed-by: Rizwan Qureshi <rizwan.qureshi@intel.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/drivers/intel/mipi_camera/chip.h

@@ -14,6 +14,14 @@
 #define MAX_GPIO_CONFIGS	4
 #define MAX_PWR_OPS		5
 #define MAX_GUARDED_RESOURCES	10
+#define IMGCLKOUT_0		0
+#define IMGCLKOUT_1		1
+#define IMGCLKOUT_2		2
+#define IMGCLKOUT_3		3
+#define IMGCLKOUT_4		4
+#define IMGCLKOUT_5		5
+#define FREQ_24_MHZ		0
+#define FREQ_19_2_MHZ		1
 
 #define SEQ_OPS_CLK_ENABLE(ind, delay) \
 	{ .type = IMGCLK, .index = (ind), .action = ENABLE, .delay_ms = (delay) }