bcma: implement setting core clock mode to dynamic

This patch is based on code from _ai_clkctl_cc() in brcmsmac.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Tested-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/bcma/core.c

diff --git a/drivers/bcma/core.c b/drivers/bcma/core.c
index 893f6e0..98e243c 100644
--- a/drivers/bcma/core.c
+++ b/drivers/bcma/core.c
@@ -77,7 +77,7 @@
 			pr_err("HT force timeout\n");
 		break;
 	case BCMA_CLKMODE_DYNAMIC:
-		pr_warn("Dynamic clockmode not supported yet!\n");
+		bcma_set32(core, BCMA_CLKCTLST, ~BCMA_CLKCTLST_FORCEHT);
 		break;
 	}
 }