soc: qcom: preserve CPU endianness for QMI_DATA_LEN

To ensure correct handling of endianness in the QMI subsystem, the
QMI_DATA_LEN field used in host-side drivers remains in CPU-native byte
order. Remove unnecessary endianness conversions, considering that
QMI_DATA_LEN is always of type `u32` on the host. On the QMI wire
interface, however, its representation is variable and may use either 1 or
2 bytes.

Signed-off-by: Alexander Wilhelm <alexander.wilhelm@westermo.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20251119104008.3505152-4-alexander.wilhelm@westermo.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

Author: alewi-westermo

drivers/soc/qcom/qmi_encdec.c

@@ -406,6 +406,7 @@ static int qmi_encode(const struct qmi_elem_info *ei_array, void *out_buf,
 			break;
 
 		case QMI_DATA_LEN:
+			memcpy(&data_len_value, buf_src, sizeof(u32));
 			data_len_sz = temp_ei->elem_size == sizeof(u8) ?
 					sizeof(u8) : sizeof(u16);
 			/* Check to avoid out of range buffer access */
@@ -416,15 +417,13 @@ static int qmi_encode(const struct qmi_elem_info *ei_array, void *out_buf,
 				return -ETOOSMALL;
 			}
 			if (data_len_sz == sizeof(u8)) {
-				val8 = *(u8 *)buf_src;
-				data_len_value = (u32)val8;
+				val8 = data_len_value;
 				rc = qmi_encode_basic_elem(buf_dst, &val8,
 							   1, data_len_sz);
 				if (rc < 0)
 					return rc;
 			} else {
-				val16 = *(u16 *)buf_src;
-				data_len_value = (u32)le16_to_cpu(val16);
+				val16 = data_len_value;
 				rc = qmi_encode_basic_elem(buf_dst, &val16,
 							   1, data_len_sz);
 				if (rc < 0)
@@ -721,7 +720,6 @@ static int qmi_decode(const struct qmi_elem_info *ei_array, void *out_c_struct,
 	int rc;
 	u8 val8;
 	u16 val16;
-	u32 val32;
 
 	while (decoded_bytes < in_buf_len) {
 		if (dec_level >= 2 && temp_ei->data_type == QMI_EOTI)
@@ -773,8 +771,7 @@ static int qmi_decode(const struct qmi_elem_info *ei_array, void *out_c_struct,
 					return rc;
 				data_len_value = (u32)val16;
 			}
-			val32 = cpu_to_le32(data_len_value);
-			memcpy(buf_dst, &val32, sizeof(u32));
+			memcpy(buf_dst, &data_len_value, sizeof(u32));
 			temp_ei = temp_ei + 1;
 			buf_dst = out_c_struct + temp_ei->offset;
 			tlv_len -= data_len_sz;