samsung-zeroltexx: Remove empty strings (review comment) and fill partition names for heimdall.

device/testing/device-samsung-zeroltexx/deviceinfo

@@ -7,8 +7,6 @@ deviceinfo_name="Samsung Galaxy S6 edge"
 deviceinfo_manufacturer="Samsung"
 deviceinfo_codename="samsung-zeroltexx"
 deviceinfo_year="2015"
-deviceinfo_dtb=""
-deviceinfo_modules_initfs=""
 deviceinfo_arch="aarch64"
 
 # Device related
@@ -20,7 +18,6 @@ deviceinfo_screen_height="2560"
 
 # Bootloader related
 deviceinfo_flash_method="heimdall-bootimg"
-deviceinfo_kernel_cmdline=""
 deviceinfo_generate_bootimg="true"
 deviceinfo_bootimg_qcdt="true"
 deviceinfo_bootimg_mtk_mkimage="false"
@@ -31,5 +28,5 @@ deviceinfo_flash_offset_ramdisk="0x01000000"
 deviceinfo_flash_offset_second="0x00f00000"
 deviceinfo_flash_offset_tags="0x00000100"
 deviceinfo_flash_pagesize="2048"
-deviceinfo_flash_heimdall_partition_kernel=""
-deviceinfo_flash_heimdall_partition_system=""
+deviceinfo_flash_heimdall_partition_kernel="BOOT"
+deviceinfo_flash_heimdall_partition_system="SYSTEM"