platform/x86/amd/pmf: Do not use readl() for policy buffer access

The policy buffer is allocated using normal memory allocation
functions, so readl() should not be used on it.

Compile-tested only.

Fixes: 7c45534a ("platform/x86/amd/pmf: Add support for PMF Policy Binary")
Signed-off-by: Armin Wolf <W_Armin@gmx.de>
Reviewed-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
Link: https://lore.kernel.org/r/20240304205005.10078-3-W_Armin@gmx.deReviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

drivers/platform/x86/amd/pmf/tee-if.c

@@ -249,8 +249,8 @@ static int amd_pmf_start_policy_engine(struct amd_pmf_dev *dev)
 	u32 cookie, length;
 	int res;
 
-	cookie = readl(dev->policy_buf + POLICY_COOKIE_OFFSET);
-	length = readl(dev->policy_buf + POLICY_COOKIE_LEN);
+	cookie = *(u32 *)(dev->policy_buf + POLICY_COOKIE_OFFSET);
+	length = *(u32 *)(dev->policy_buf + POLICY_COOKIE_LEN);
 
 	if (cookie != POLICY_SIGN_COOKIE || !length)
 		return -EINVAL;