thermal/drivers/core: Add init section table for self-encapsulation

Currently the governors are declared in their respective files but they
export their [un]register functions which in turn call the [un]register
governors core's functions. That implies a cyclic dependency which is
not desirable. There is a way to self-encapsulate the governors by letting
them to declare themselves in a __init section table.

Define the table in the asm generic linker description like the other
tables and provide the specific macros to deal with.

Reviewed-by: Amit Kucheria <amit.kucheria@linaro.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>

include/asm-generic/vmlinux.lds.h

@@ -239,6 +239,16 @@
 #define ACPI_PROBE_TABLE(name)
 #endif
 
+#ifdef CONFIG_THERMAL
+#define THERMAL_TABLE(name)						\
+	. = ALIGN(8);							\
+	__##name##_thermal_table = .;					\
+	KEEP(*(__##name##_thermal_table))				\
+	__##name##_thermal_table_end = .;
+#else
+#define THERMAL_TABLE(name)
+#endif
+
 #define KERNEL_DTB()							\
 	STRUCT_ALIGN();							\
 	__dtb_start = .;						\
@@ -608,6 +618,7 @@
 	IRQCHIP_OF_MATCH_TABLE()					\
 	ACPI_PROBE_TABLE(irqchip)					\
 	ACPI_PROBE_TABLE(timer)						\
+	THERMAL_TABLE(governor)						\
 	EARLYCON_TABLE()						\
 	LSM_TABLE()