Use GCC-compatible alignment specifier in TM4C NetworkInterface.c (#1027)

* Use GCC-compatible alignment specifier in TM4C NetworkInterface.c

Replace the CCS-only pragma with GCC attribute. Fixing this along with #1206 will make this file build without warnings on the ARM GNU toolchain.

The CCS compiler does support this attribute, see section 5.17.2 in: https://www.ti.com/lit/ug/spnu151w/spnu151w.pdf?ts=1695011722091

* Uncrustify: triggered by comment.

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Co-authored-by: GitHub Action <action@github.com>

Author: jonathangjertsen

source/portable/NetworkInterface/TM4C/NetworkInterface.c

@@ -132,8 +132,7 @@ static tEMACDMADescriptor _rx_descriptors[ niEMAC_RX_DMA_DESC_COUNT ];
 static tDescriptorList _tx_descriptor_list = { .number_descriptors = niEMAC_TX_DMA_DESC_COUNT, 0 };
 static tDescriptorList _rx_descriptor_list = { .number_descriptors = niEMAC_RX_DMA_DESC_COUNT, 0 };
 
-static uint8_t _network_buffers[ ipconfigNUM_NETWORK_BUFFER_DESCRIPTORS ][ BUFFER_SIZE_ROUNDED_UP ];
-#pragma DATA_ALIGN(_network_buffers, 4)
+static uint8_t _network_buffers[ ipconfigNUM_NETWORK_BUFFER_DESCRIPTORS ][ BUFFER_SIZE_ROUNDED_UP ] __attribute__( ( aligned( 4 ) ) );
 
 static EthernetPhy_t xPhyObject;