thermal/drivers/samsung: Enable TMU by default

thermal/drivers/samsung: Enable TMU by default

The SoC Thermal Management Unit (TMU) is essential for proper operation
of the SoCs.  Kernel should not ask users choice of drivers when that
choice is obvious and known to the developers that answer should be
'yes' or 'module'.

Impact of making it default:

1. arm64 defconfig: No changes, already present in defconfig.

2. arm32: No changes, the driver is already selected by MACH_EXYNOS.

3. COMPILE_TEST builds: enable by default for arm32 or arm64 builds,
   whenever ARCH_EXYNOS is selected.  This has impact on build time and
   feels logical, because if one selects ARCH_EXYNOS then probably by
   default wants to build test it entirely.  Kernels with COMPILE_TEST
   are not supposed to be used for booting.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org>
Link: https://patch.msgid.link/20260526135312.8697-2-krzysztof.kozlowski@oss.qualcomm.com