amd/stoneyridge: Add generic IMC sleep and wakeup

Hudson code, the basis for soc//stoneyridge southbridge, has typically
contained direct calls to vendorcode/amd//ImcLib.c.  In an effort to
keep #include files clean in other stoneyridge files, put the new calls
into imc.c.

Change-Id: I830d5431635ac4acaf3c3c974cb452847dc147cd
Signed-off-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-on: https://review.coreboot.org/22407
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marc Jones <marc@marcjonesconsulting.com>

src/soc/amd/stoneyridge/imc.c

@@ -78,3 +78,13 @@ void enable_imc_thermal_zone(void)
 	WriteECmsg(MSG_SYS_TO_IMC, AccessWidth8, &FunNum, &StdHeader);
 	WaitForEcLDN9MailboxCmdAck(&StdHeader);
 }
+
+void imc_sleep(void)
+{
+	ImcSleep(NULL);
+}
+
+void imc_wakeup(void)
+{
+	ImcWakeup(NULL);
+}

src/soc/amd/stoneyridge/include/soc/imc.h

@@ -18,5 +18,7 @@
 
 void imc_reg_init(void);
 void enable_imc_thermal_zone(void);
+void imc_sleep(void);
+void imc_wakeup(void);
 
 #endif