ipa: fix compile-testing with qcom-mdt=m

There are multiple drivers that use the qualcomm mdt loader, but they
have conflicting ideas of how to deal with that dependency when compile-testing
for non-qualcomm targets:

IPA only enables the MDT loader when the kernel config includes ARCH_QCOM,
but the newly added ath12k support always enables it, which leads to a
link failure with the combination of IPA=y and ATH12K=m:

aarch64-linux-ld: drivers/net/ipa/ipa_main.o: in function `ipa_firmware_load':
ipa_main.c:(.text.unlikely+0x134): undefined reference to `qcom_mdt_load

The ATH12K method seems more reliable here, so change IPA over to do the same
thing.

Fixes: 38a4066f593c ("net: ipa: support COMPILE_TEST")
Fixes: c0dd3f4f7091 ("wifi: ath12k: enable ath12k AHB support")
Signed-off-by: Arnd Bergmann <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

drivers/net/ipa/Kconfig

···
 	depends on INTERCONNECT
 	depends on QCOM_RPROC_COMMON || (QCOM_RPROC_COMMON=n && COMPILE_TEST)
 	depends on QCOM_AOSS_QMP || QCOM_AOSS_QMP=n
-	select QCOM_MDT_LOADER if ARCH_QCOM
+	select QCOM_MDT_LOADER
 	select QCOM_SCM
 	select QCOM_QMI_HELPERS
 	help