[Mellanox]Adding new line to SN4700-O8V48 SAI profile (#20511)

### Why I did it
Fixing #20466. Adding newline at the end of sai.profile

### How I did it
Added missing newline.

#### How to verify it
Loading with the SKU and check if everything works fine.

Author: dgsudharsan

device/mellanox/x86_64-mlnx_msn4700-r0/Mellanox-SN4700-O8V48/sai.profile

@@ -1,4 +1,4 @@
 SAI_INIT_CONFIG_FILE=/usr/share/sonic/hwsku/sai_4700_8x400g_48x200g.xml
 SAI_DEFAULT_SWITCHING_MODE_STORE_FORWARD=1
 SAI_INDEPENDENT_MODULE_MODE=1
-SAI_NOT_DROP_SIP_DIP_LINK_LOCAL=1
+SAI_NOT_DROP_SIP_DIP_LINK_LOCAL=1